# Proposed AD FAA-2006-25086: Fokker Model F27 Mark 500 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-25-06
- Products: Fokker Services B.V.
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 21, 2006, 71 FR 35572
- Comments due: July 21, 2006
- Became: [AD 2006-25-06](https://openairdocs.org/ad/2006-25-06)
- Docket: FAA-2006-25086 (https://www.regulations.gov/docket/FAA-2006-25086, where comments are filed)
- Project: 2006-NM-019-AD
- FR document: E6-9714
- Official PDF: https://openairdocs.org/files/sha256/78/5d/785d0b07bce88c1c85ac1dc5b741c2b128bf02bc43fd3caa4c0373dee498ffe3 (from https://www.govinfo.gov/content/pkg/FR-2006-06-21/pdf/E6-9714.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/06/21/E6-9714/airworthiness-directives-fokker-model-f27-mark-500-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2BDE63D8B9BD6FA68625719400612588.0001
- Page: https://openairdocs.org/proposed/FAA-2006-25086

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Fokker Model F27 Mark 500 airplanes. This proposed AD would require an inspection to determine whether certain main landing gear (MLG) drag stay units (DSUs) are installed. This proposed AD would also require an ultrasonic inspection to determine if certain tubes are installed in the affected DSUs of the MLG, and related investigative/ corrective actions if necessary. This proposed AD results from a report that, due to fatigue cracking from an improperly machined radius of the inner tube, a drag stay broke, and, consequently, led to the collapse of the MLG during landing. We are proposing this AD to prevent such fatigue cracking, which could result in reduced structural integrity or collapse of the MLG.

## Notices in this docket

- Jun 21, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-9714, comments due Jul 21, 2006 (https://www.federalregister.gov/documents/2006/06/21/E6-9714/airworthiness-directives-fokker-model-f27-mark-500-airplanes)

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